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Separation method for preparing basic magnesium carbonate and its sodium potassium salt by bittern mixed alkali method

A separation method, magnesium carbonate technology, applied in the direction of magnesium carbonate, alkali metal chloride, alkali metal halide purification, etc., can solve the problems of difficult bittern resources utilization, marine ecological environment damage, etc., and achieve easy industrialization and economic advantages Significant, utilization-enhancing effect

Active Publication Date: 2021-11-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of efficient utilization of bittern in bittern to solve the problems such as the difficulty in utilization of bittern resources and the destruction of marine ecological environment caused by the enrichment of bittern near the sea. 2+ method, and design a process for separating and utilizing the remaining ions

Method used

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  • Separation method for preparing basic magnesium carbonate and its sodium potassium salt by bittern mixed alkali method
  • Separation method for preparing basic magnesium carbonate and its sodium potassium salt by bittern mixed alkali method
  • Separation method for preparing basic magnesium carbonate and its sodium potassium salt by bittern mixed alkali method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: the specific operations are as follows:

[0045] 1. Preparation of Basic Magnesium Carbonate Crystals

[0046] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0047] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:2. After stirring for 120s, it is allowed to stand still for 2.5h to obtain a slurry.

[0048] (2) Filter the slurry obtained in step (1) to obtain 533.5g filtrate and 52.8g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.29%; K + : 0.49%; Cl - : 8.64%; SO 4 2- : 2.53%; CO 3 2- : 0.99%; H 2 O: 80.06%.

[0049] (3) Drying: Dry the solid product obtained i...

Embodiment 2

[0056] Embodiment 2: specific operation is as follows:

[0057] 1. Preparation of Basic Magnesium Carbonate Crystals

[0058] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0059] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:1.9. After stirring for 120s, let stand for 2.5h to obtain a slurry.

[0060] (2) Filter the slurry obtained in step (1) to obtain 531.3g filtrate and 50.5g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.25%; K + : 0.49%; Cl - :8.68%; SO 4 2- : 2.54%; CO 3 2- : 0.90%; H 2 O: 80.14%

[0061] (3) Drying: Dry the solid product obtained in step (2) at 100°C for...

Embodiment 3

[0068] Embodiment 3: specific operations are as follows:

[0069] 1. Preparation of Basic Magnesium Carbonate Crystals

[0070] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0071] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:2.1. After stirring for 120s, it is allowed to stand still for 2.5h to obtain a slurry.

[0072] (2) Filter the slurry obtained in step (1) to obtain 538.7g filtrate and 52.8g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.24%; K + : 0.48%; Cl - : 8.56%; SO 4 2- : 2.51%; CO 3 2- : 1.02%; H 2 O: 80.19%.

[0073] (3) Drying: Dry the solid product obtained i...

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Abstract

The invention relates to a separation method for preparing basic magnesium carbonate and its sodium potassium salt by a bittern mixed alkali method. The method comprises the following steps: (1) preparation of basic magnesium carbonate crystal: bittern is added in the reactor, then Na 2 CO 3 solution and NaOH solution to obtain a slurry; filter to obtain a filtrate and a solid; dry the solid for 8 to 10 hours to obtain basic magnesium carbonate crystals; (2) add an equivalent amount of CaCl to the obtained filtrate 2 Solution, after reaction, filter to obtain filtrate; isothermal evaporation and crystallization, and filter to obtain related substances; (3) Separation and extraction of KCl and NaCl in the remaining mother liquor. After the reaction of the present invention, the transformation of magnesium ions is nearly complete, the efficient utilization of bittern is realized, and the subsequent separation is simplified. The bittern reacts with the mixed alkali, and the mother liquor after the reaction does not contain bicarbonate ions, which simplifies the composition of the mother liquor after the reaction and reduces the difficulty of subsequent separation.

Description

technical field [0001] The invention relates to a new method for synthesizing basic magnesium carbonate by a mixed alkali method and the separation of subsequent mother liquor. Background technique [0002] The mother liquor after seawater evaporation and salt production is called bittern. The mother liquor contains a large amount of sodium, magnesium, potassium and other inorganic salts. It is a treasure house of valuable resources. The by-product of bittern in my country is 20 million cubic meters per year. 3 , but the utilization rate of bittern is less than 20%, and a large amount of bittern resources are discharged into the sea or circulated in salt pans, which not only causes a waste of resources but also affects the ecological balance of offshore waters. Therefore, the efficient and comprehensive utilization of bittern resources has always been a topic worthy of discussion and research. [0003] Bittern contains a large amount of magnesium salt, which is converted in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24C01D3/14C01D3/06
CPCC01D3/06C01D3/14C01F5/24
Inventor 曹吉林王晶瑶郭宏飞赵斌陈学青谭朝阳张广林
Owner HEBEI UNIV OF TECH
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